Possible Clues:

• Song in praise of 22 down
• Song from that bloke on the radio
• 'Day Is Dying in the West,' for one
• "The Battle __ of the Republic"
• What'll get holy men singing their hearts out?
• Song heard on Sunday morning
• How you may need to start a song?
• Service lines?
• It's before I turn over my nitrogen for mass production!
• Song sung in pews